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S.O.S. Echendu, H.R. Tamaddon-Jahromi, M.F. Webster
Modelling Reverse Roll Coating flow with dynamic wetting lines and inelastic shear thinning fluids
Appl. Rheol. 23:6 (2013) 62388 (13 pages)
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This study addresses the Taylor-Galerkin/pressure-correction solution of industrial high-speed reverse roller coating flow
associated with thin-film paint-coatings of strip-steel. Novel aspects lie in the inclusion of the dynamic wetting line and flow
analysis due to surface tension and inelastic rheology effects, via shear-thinning and lowering high shear viscosity levels. The
main aim of the study is to predict the zonal flow influences by examining viscous flow structures around the meniscus, nip
and wetting line regions, conveyed via streamline and shear rate patterns, surface distributional lift and localised nip-pressures.
The majority of this study focuses on the secondary nip-vortex and its influences on the contact point and dynamic
wetting line. This aspect of the flow provides the driving mechanism for the onset of instabilities, which governs the entire
process and tends to determine the consistency of the film thickness at the outflow. Positive peak-pressures tend to increase
with decrease in nip-gap size. At low nip-gap size, negative peak pressures are observed around the substrate-wetting line
contact region. At higher speed-ratios, positive peak pressures are seen to increase with less recirculation apparent around
the contact zone. Significantly and upon surface tension increase, the dynamic wetting line is sucked further inwards
towards the nip-gap, stimulating a localised wetting line-foil third vortex structure, which causes an apparent reduction in
film-leakage thickness.
► Cite this publication as follows:
Echendu S, Tamaddon-Jahromi H, Webster M: Modelling Reverse Roll Coating flow with dynamic wetting lines and inelastic shear thinning fluids, Appl. Rheol. 23 (2013) 62388.
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